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Related Party Transactions - Additional Information (Detail)
shares in Thousands, $ in Thousands, $ in Thousands
 1 Months Ended 12 Months Ended
Jul. 31, 2019
TWD ($)
shares
Jul. 31, 2019
USD ($)
shares
Feb. 28, 2018
TWD ($)
shares
Dec. 31, 2019
TWD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
TWD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
TWD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2019
USD ($)
ASE Cultural and Educational Foundation [member] | Environmental charity [member]                    
Disclosure of transactions between related parties [line items]                    
Amount contributed related party transactions       $ 100,000 $ 3,343 $ 100,000 $ 3,343 $ 100,000 $ 3,343  
Associates [member]                    
Disclosure of transactions between related parties [line items]                    
Real estate properties acquired       $ 2,326,000           $ 77,767
USI Enterprise Limited [member]                    
Disclosure of transactions between related parties [line items]                    
Repurchase of outstanding ordinary shares | shares 2,805 2,805 1,283              
Value of ordinary shares purchased $ 1,247,187 $ 41,698 $ 653,244